A 100.-kilogram cart accelerates at 0.50 meter per second squared west as a horse exerts a force of 60. newtons west on the cart. What is the magnitude of the force that the cart exerts on the horse?
According to Newton's third law of motion, the force exerted by the horse on the cart is equal in magnitude but opposite in direction to the force exerted by the cart on the horse.
Since the force exerted by the horse on the cart is 60 newtons west, the magnitude of the force that the cart exerts on the horse is also 60 newtons.